The average length of time it took for the children to fall asleep was 26 minutes in the study, which was carried out in Australia.

Bedtime story

And the secret to a good night's sleep?

Mandy Gurney, who's a sleep scientist says "A quiet time before bed, a warm bath, but no longer than 10 minutes, and then straight into a darkened bedroom.... and you can cap it all off with a bedtime story."